Date: Thu, 31 Mar 2016 12:06:47 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Bug in timezone handling (new zonename format like '<+04>-4' ) On Thu, Mar 31, 2016 at 06:50:14PM +0300, Hannu Nyman wrote: > The IANA timezone zoneinfo maintainers have decided to introduce new > timezones in a simplified format with 2016b zoneinfo. > No more invented name strings, but just the time offset inside <...> > This seems to break musl. > > http://mm.icann.org/pipermail/tz-announce/2016-March/000036.html > New zones Europe/Astrakhan and Europe/Ulyanovsk ... Asia/Barnaul ... > As a trial of a new system that needs less information to be > made up, the new zones use numeric time zone abbreviations like > "+04" instead of invented abbreviations like "ASTT". > > I have tested with Openwrt trunk using musl (with Linux kernel 4.1) > and older uClibc-based Openwrt CC15.05.1. > The uClibc-based system uses the new zones ok, but the musl-based > build behaves badly, as it defaults to GMT and shows the zonename as > '+04>-4'. (This is when full zoneinfo files are not installed and > just the TZ variable is used.) > > Examples at https://github.com/openwrt/luci/issues/675 > > (note: Openwrt patches musl to store TZ in /etc/TZ instead of an env > variable, but that should have no impact in the displayed timezone.) > > Example with musl: > > old zone is ok: > Europe/Helsinki > root@...nWrt:~# cat /etc/TZ > EET-2EEST,M3.5.0/3,M10.5.0/4 > root@...nWrt:~# uptime > 11:00:52 up 18:17, load average: 0.43, 0.13, 0.11 > root@...nWrt:~# date > Wed Mar 30 11:00:55 EEST 2016 > > "new zone" is handle wrongly: > Europe/Astrakhan > root@...nWrt:~# cat /etc/TZ > <+04>-4 > root@...nWrt:~# uptime > 08:02:52 up 18:19, load average: 0.17, 0.18, 0.13 > root@...nWrt:~# date > Wed Mar 30 08:02:59 +04>-4 2016 > (That should be Helsinki+1 (= +2 -DST) = 12:02:59) I thought this was some nonstandard extension conflicting with standard handling of the TZ variable, but in fact it's documented in current POSIX as a quoted form: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03 Does the specification there agree with your expectations of how it should behave? Do you have any other references I could look at on how this is supposed to be used? Rich
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